Just got some new DIY supplies today and ordered some sweetener to add to some of my juices. I have made some of my own juices before but not using sweetener. From what I've read it's highly concentrated and I was wondering approx how much sweetener I should use to make a 15ml bottle of juice? Approx numbers are fine I know it varies. I generally do about 25-30% flavoring if that makes a difference. Thanks in advance for any advice!